Screen or separator.



T. L. STURTEVANT.

SCREEN OR SEPARATOR. v

APPLICATION FILED OCT. 7, 1914 Patented Jan. 19, 1915.

' attozncgi pnrrnn s rens,

Partn r orrion- VANT MILL COMPANY,

A CQRPORATION OF MAINE.

SCREEN on .snranaron.

= Specification of Letters Patent.

Patented Jan. 19, 9115.

Application filed- October 7, 1914. Serial No. 865,466.

v To all whom it may concern Be it known that I, THOMAS L. S'run'rnvAnT, a citizen of the United States, residing at Quincy, in the county ofNorfolk and State of Massachusetts, have invented or discovered certain new and useful Improvements in Screens or the following is a specification, reference being had therein to the accompanying drawmg.

This invention relates to the screens or sieves of separators, and means for supporting same, the invention being particularly intended for use in that class of separators in which the screens or sieves are supported resiliently in an inclined position and are jarred or vibrated by the percussive action of hammers.

The present invention has for its principal object to provide screens which in themselves havegreat resilience and which comprise metallic frames and fine mesh wire cloth stretched thereon, the improved screens being of such construction that they will be light, durable and at the same time inexpensive. The frames of the improved screens preferably comprise elastic strengthenin and stretchin bars which ma be.

bowed downwardly or outwardly away from the wire mesh I willbe so attached to the side bars of the, screen frames as to have a tendency to stretch the wire mesh screen clothing and hold it taut, To this end each rectangular screen frame preferably comprises side bars and end bars of angle-iron joined together at their corners where they may be provided with triangular sheet metal fastening corner pieces. Each screen comprises, betweenjits end bars, a series of resilient cross bars the ends of which are sprung into place in such a manner as to impingeagainst the vertical flanges of the angle-iron side bars, and notwithstanding'thatthese cross bars may be attached to the horizontal flanges of the side bars they will tend to press the sidebars outward and will thus serve to hold the wire mesh screen clothing taut, and the strain of their outward pressure will be exerted against the" vertical flanges of the side bars in such amanner as. very'largely to relieve their attaching rivets from strain. The screens are preferably supported on the Separators, of which screen clothing and whichside bars,

'ofthe angle iron irons forming inclined channels, and the vcr tical flanges of which angleirons are loosely overlapped by the vertical flanges of th side-bar angle-iron screen frames so that thesaid screenframes will be loosely sup ported on the angle irons of the separator frame in such a manner that the scrcens will be held in place but may vibrate freely under percussive jarring action, the screen supports themselves being preferably more or less resilient.

in the accompanying drawings Figure 1 is a bottom view of one of the improved screens. Fig. 2 is a cross section of two of the improved screens and their supports. Fig. 3 is a view similar to Fig; 2 but showing a slightly modified form of screen frame. Fig. 4 is a partial longitudinal section of one of the screens showing the manner in which it is supported at its upper end. Fig. 5 is a detail view showing a slightly modified form of the invention.

Referring to the drawings, the improved screen preferably comprises angle-iron side' bars 12 and angle-iron end bars 13 properly secured together at the corners of the screen and preferably by triangular plates 15 riveted to the horizontal flanges of said angleiron side bars and end bars; and 1% denotes wire mesh screenclothing attached to the screen frame in any suitable manner, as by being riveted thereto. Each screen, between its end bars, comprises a series of elastic cross bars 16 which are preferably of resilient steel, and which may be bowed downwardly or outwardly away from the-wire mesh screen clothing, these cross bars being preferably sprung into place with their ends abutted against the vertical flanges of the angle-iron side bars. Thus these bowed cross bars, bearingat their ends against the vertical flanges of the side bars of the screen frame, will, because of their tendency to straighteri out, serve to hold the wire mesh screen clothing elastically .taut, and notwithstanding that they may be riveted (preferably somewhat loosely) to the horizontal flanges of the angle iron the stretching strain of the cross bars, coming mostly on the vertical flanges side bars, very largely relieves the attaching" rivets ofsaid bars inclined separator frame by means of angle 50 i mers, as 2-2, which may be arranged'to strike l'onimpact blocks, as 28, between the inner from strain. These elastic stretching cross bars 16 may be advantageously used in screen frames consisting of flat metal bars, as will'be understood from Fig. 5, as well as in angle-iron frames.

The screens are preferably loosely sup: ported in place at their outer edges by means of angle iron bars 17 attached to the side walls 18 of the separator frame, and are also preferably loosely supported at their in- -ner edges on a channel iron anglebar 19. These supporting angle iron bars 17 and 19 are inclined with the separator frame and said screen will yield more or less under. the impact of the strokes .of the vibrating hammers, and thus the screens will be suitably jarred percussively in, as to make the screening-operation very effective. The outer sides of the screens.

are rigidly supported by the angle iron bars 17 which arerigidly' attached to the side walls 18of the separator frame.

To hold the inclined screens in place against the action of gravity the upper'angle iron end bars theregf may be hooked into a transverse angle iron supporting bar 20 on-the separatorframe, or may be otherwise suitably supported. To prevent'the outer side bars of the screen frame from becoming disengaged from their supporting outer edge angle iron bars 17 the separator frame is preferably provided with pivoted buttons 21 which will prevent the screensfrom jumping out of engagement with-their outer side supporting bars, while the-inner edges of the screens may be prevented from jumping out of the central supporting angle iron channel bar 19 (when not secured there to by bolts or otherwise) by vibratingham- :-side bars of the screen frames, as indicated ,f in Fig. 2, or they may strike directly on the flanges of the channel bar, as indicated in Fig. 3, the lift of the hammers from said blocks or from the flanges of the inner side bars ma be, m such case, less than the depth 0 the vertical flanges of the anglev iron side bars extending into the angle iron bars 17. The vertical flanges of the supporting angle iron bars 17 and 19 will preferablyibe higher or of greater vertical extent than the vertical extent of the flanges of the angle iron side bars of the screen partly or Wholly such a manner angle :iron bars 17.

frames, so that the last-named flanges will not touch the. bottoms or horizontal portions of the supporting angle iron bars, and

the screens may thus restmore or less loosely in place so as to be free to be vibrated by the percussive strokes of the vibrating hammers. In cases, however, where the ut-' most resiliency of the screen frames is not required" the said frames may be'bolted or otherwise rigidly secured to their supports.

The angle irons comprising the screen frames will preferably be of the tri-flange type shown more clearly in Fig. 8, but may be of the right-angular bi-flange type shown in- Fig. 2. 'By using angle irons of the triflange. type the flanges projecting above the level of thewire mesh screen clothing will serve, in a degree, to prevent the escape of material from the sides of the screens, but

should'any such material escape from the sides of the screens it will pass down the channels afforded by the side and central angle iron bars'li' and 19.

' Although it is preferred to construct the screen frames throughout of angle irons 1t maysometimes be advantageous to make the screen frames partly of angle irons and partly of flat irons. This whole screen frame plan, with its resilient supports, is

designed in every part to afford a separator constructlon in which the screens w1ll be more resilient than in any other similarseparator construction heretofore devised.

Theterm angle 1ron,-as herein used willbe .understood to refer to angle bars preferably of steel-rather than iron, and

will also be understood to. refer to either a bi fiange or' a tri-flange construction, as also to a channel iron construction, as the angle iron channel bar 19, or the side-supporting The improved screen frames, while not being-expensive to make, are, above all, very addition tobeing'very durable, .are capable resilient when percussively vibrated and in of being mounted in place in such a manner as\to secure the highest efficiency in a separator.

- The invention is not to be understood as being limited to the details herein shown, or to any particular means for supporting the screen frames, since they may be secured in place in the separator in any suitable or desired manner.

Having thus described my invention I claim and desire to secure by Letters Patent:

1. A separator screen consisting of a rectangular metallic frame and, wire mesh clothing stretched thereon, combined with bowed elastic cross bars for holding the said screen clothing under elastic tension.

1 2. A separator screen consisting of a rectangular metallic frame, comprising side bars, and end bars, and wire mesh clothing stretched on said frame, combined with ends of which abut against the Vertical stretching means arranged between said end bars and forming parts of the screen frame itself, said stretching means acting outwardly on said side bars, and serving to hold said screen clothing .under elastic tension.

A separator s'creen consisting of a rectangular metallic frame and wire mesh screen clothing attached to the upper side thereof, combined with elastic cross bars attached to the under side of said frame'and serving to keep the said screen clothing under elastic tension. 4. A separator screen consisting of an angle iron frame and Wire mesh screen clothing stetched thereon, said screen frame comprising resilient'bowed cross bars the flanges of the frame. I

5. A separator screen consisting of an angle iron frame and -wire mesh screen clothing stretched thereon, combined .with angle iron frame supports into which the angle iron side bars of the said screen frame is adapted to hook.

6. A angle iron frame and wire mesh screen clothing stretched thereon, combined with angle iron frame supports into which the said screen frame is adapted to hook, said screen frame com prising resilient bowed cross bars the ends of which abut against separator screen consisting of an the vertical flanges of the angle iron side bars of the frame.

7 In a separator, a plurality .of screens each of which consists of. an angle-iron frame and wire mesh screen clothing stretched thereon, combined piecesof a separator frame, angle-iron supports attached to said side pieces and sus taining the outer edges of said screens, and a channel angle-iron support sustaining the inner edges of said screens. c

-8. In a separator, a plurality of screens with the side I each of which consists of an angle-iron frame and Wire mesh screen clothing stretched thereon, combined with the sides of a separator frame, angle-iron supports attached to said side pieces sustaining the outer edges of said screens, a channel angleiron support sustaining'the inner edges of said screens, means, at the inner edges of said screens, for percussively jarring the lat ter, and means for preventingthe disengagement of said screens from their sup ports under percussive jarring action.

.In testimony whereof I aliix my signature,

in presence of two Witnesses THOMAS LEGG'ETT STURTEVANT.

Witnesses:

WV. H. ELLIS, GRACE G. GODFR Y. 

